Overall Health

Are you medically fit to conduct a CCR dive today

Are you of sound mind to conduct a CCR dive today


Oxygen Tank - Check Content

Oxygen Tank - Check Preassure

CMF Check - Close O2 valve and count time to drop 10 Bar - should be 10 seconds

Diluant and Bailout

Dilluent and Bailout Tank(s) - Check Content - O2% and He%

Diluent & Bailout Tank(s) - Check Preassure

PPO (Monox) Display

Check Battery Plug

Turn on Display

Battery Check

Check calibration in Air (0.21-0.21-0.21 at sea level)

If sensors don't align as above - calibrate in Air

Shearwater Computer

Turn on Shearwater

Battery Check

Check calibration in air (0.21-0.21-0.21 at sea level)

Scrubber Canister

Filling of Canister done correctly

2 internal canister O-rings control

Close + Canister Markings

Canister positive and negative leak tests

Counter Lungs

Exhale Counter-lung fitting

Inhale Counter-lung fitting - check no water is present in the lung

Canister / Counter-lung Connection


Mouthpiece & Mushroom Valves Visual Control

Check Mushroom valves

Positive and Negative Loop Pressure Test

Conduct Loop Flow Gas Test

Loop / Counter-lung connection

Gas Line

ADV / Exhale Counter-lung Connection

Tank / First stage connection


Cells housing / inhale counter-lung connection

Positive / Negative Pressure Check

Positive test (counter-lung position control) 2 min

Negative test 2 min


Oxygen flush calibration check - if required, calibrate

PpO2 display calibration

Shearwater calibration (required when sensors didn't align in air)

Ensure all monitors agree, otherwise re-calibrate

BCD & ADV Check

BCD and ADV connection

BCD and ADV operating control


Complete 5 minute Pre-Breathe


Conduct Pre-Dive Safety Check

Undertake O2 Flush at 5m - Check Cells

Open Dill Valve and complete Dill Flush

Please note that this checklist is a hypothetical example and provides basic information only. It is not intended to take the place of, among other things, workplace, health and safety advice; medical advice, diagnosis, or treatment; or other applicable laws. You should also seek your own professional advice to determine if the use of such checklist is permissible in your workplace or jurisdiction.